Assigistoe to the



(No Model.)

G. F. HUTGHINS.

SHEDDING MECHANISM FOR Looms.

No. 380,118. Patented Mar. 2-7, 1888.

Him

ill L3 WWW UNITED STATES 1 PATENT CFFIcE.

GEORGE F. HUTCHINS, OF WORCESTER, MASSACHUSETTS, ASSIGNORTO THE KNOWLES LOOM WORKS, OF SAME PLACE.

SHEDDING MECHANISM FOR LOOMS.

SPECIFICATION forming part of Letters P atent No. 380,118, dated March 27, 1888.

Application filed July 28, 1887.

To all whom it may concern:

B e it known that I, GEORGE E. HU'rcHINs, a c1t1zen of the United States, residing at Worcester, in the county of Worcester and ism for connecting the harness-frames of looms to the operating jacks or levers; and the obect of my invention is to provide a convenient means of increasing the shed of looms without changing the angular movement of the jacks, and consequently the actuating parts of the harness-motion.

Referring to the drawings, Figure 1 is a side elevation of a detached portion of a loom of ordinary construction, sufficient to show the application of my invention. Fig. 2 is an end elevation, and Fig. 3 a plan, of different parts shown inFig. 1. v i

In the accompanying drawings, 1 is the top railor arch of the loom-frame, of well-known construction, in which the jacks 2 2, 3, and 4 are pivoted at 5, and connected to the actuating mechanism (not shown) by means of the links 6.

The part marked 7 is the near row of grooved sheaves over which the harness-cords pass, connecting the jacks 2 2 to the harness-frames 8, in the usual manner. The sheaves 7 are mounted upon a shaft, 9, the ends of which are flattened to enter supporting grooves or sockets 11, made in the top rail, 1, as shown in Fig.

3, also in the usual way.

10 is the usual hand-screw and check-nut tapped into the top rail, 1, and by means of which the shaft 9, and with it the row of sheaves 7, may. be raised or lowered, all in the usual manner.

In order to secure proper shedding of the warp, the back harnesses are made to travel farther than the front harnesses by attaching Serial No. 245,497. (No model.)

the cords to the jacks at greater distances from the .pivotsof said jacks than the front; harnesses, and the proper gradation of movement of the intermediate harnesses is secured by the graded notches 21 on the jacks.

Sometimes the harness-motion is constructed so as to give greater angular movement to the back jacks; but the. graded notches are still retained to aid in varying the shed and insecuring proper gradation.

There is a limit to the amount of variation that can be attained by different lengths of jacks, inasmuch as lengthening the jack reduces the angles between the jacks and the cords 12, (dotted lines, Fig. 1,) that pass over' the near row of sheaves, so that less of the horizontal movement (as from 3 to 4) of the jack is transmitted to the harness-frame, while the angle between the jack and the companion cord, 13, (dotted lines, Fig. 1,) that passes over the farther row of sheaves, (not shown,) is not reduced so much. The effect of this is to tilt the harness-frame out of level and to form an uneven shed through which the shuttle cannot pass freely.

It is frequently desirable in changing the weave, stock, or some other conditions of the loom to vary the shed more than can be com- 1 fortably provided for in the construction of the harness-motion andlength of jack. I

The purpose of my present invention is to meet this emergency and to provide means for varying the shed as much as desired, and this I accomplish in the following manner: A number of back jacks are taken out and longer ones, 3 and 4, are readily substituted. The same number of sheaves 7 are taken off the back end of the shaft 9, and the hub 15 of the stand 14 put in their place and fastened by setscrew '16. To the upper end of the stand 14 is secured the stud 17,0n which the supplementary sheaves 18 are placed. The length of the stand 14 is such that the angles between the cords 20, passing over -the sheaves 18 and the long jacks 3 and 4, are about the same as the angles between the'cords (not shown) passing over the sheaves 7 and the short jacks.

It will readily be seen that my device corrects the tendency to tilt the harnesses and permits an unlimited variation in the shed.

ICO

The hub 15 of the stand 14: may have cast upon it alug, 19,which enters a groove, 11, in the frame 1 at the end of the shaft 9 to keep the stand 14 in an upright position. Thestand 14 is made with an oifset, so as to permit the back sheaves to come flush with the inside face of the top rail, 1, so that the full width between the rails may be utilized, if necessary.

The attachment of the stand 14 to the shaft 9, as above described, is an essential feature of my invention, as all the harnesses are still adjustable together by means of the handscrew 10.

Having thus described my invention, What I claim as new, and desire to secure by Letters Patent, is

1. In a loom, the combination, with the reciprocating jacks of a loom harness motion, cords passing over guidesheaves, said guidesheaves, and the sheave-shaft upon which they 20 are supported, of an extension sheave-stand attached to said sheave shaft, and supplementarysheaves supported on said stand, sub stantially as shown and described.

2. In a loom, the combination, with the 25 sheave-shaft 9 and the sheaves 7, supported on said shaft 9, of the extension sheave-stand 14, provided with the hub 15 at its lower end, to be secured upon the sheave-shaft 9, and a stud, 17, at its upper end, upon which are supported the supplementary sheaves 18, and said sheaves 18, all constructed and combined together substantially as shown and described.

GEORGE F. HUTOHINS.

Witnesses:

J GEN O. DEWEY, LAURA HARPER. 

